Are you sure you don't just have a pimple? What makes you think it's a cold sore and not something else? I'm not trying to trivialise your discomfort or concern, but you could be worried needlessly.
There are OTC creams and ointments that will help speed healing of cold sores (Abreva is the one I've heard of most often), as well as prescription creams (Denavir and Zovirax come to mind).
*If* it's herpes, you should definitely avoid kissing people and other skin-to-skin contact with your mouth while you have symptoms. Wash your hands after touching the area. Keeping the area clean and dry also helps.
If you think you just contracted it, you might have a higher rate of outbreaks and viral shedding between outbreaks than if you've had it for a year or more, so be aware of tingling, itching and pressure in that or surrounding areas and consider that they *might* be signs of viral shedding, but unfortunately that can happen even without symptoms. Just be aware and get a sense of the patterns; you don't have to go into panic mode at every itch or twitch.
Finally: Get a doctor to look at it and find out for sure if that's what you have. It might be too late to do a swab culture on it (with or without a wet blister) but if your doc can use a PCR DNA swab test it might pick it up. Unfortunately if the result is negative, it's not conclusive. If you *really* want to know, get a type-specific blood test done (you don't need active symptoms to do a blood test). However if you think you just caught it, it might not show up for a few months in a blood test.
If it turns out you do have oral HSV-1 (the most common cause of cold sores), you have joined as much as 90% of the population who already have it, so you're not alone.
Good luck! Let us know how you make out.
TheOneInFour
HSV-1... what do I do? 
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